diff --git a/crypto/mem.c b/crypto/mem.c
index 628b650216..5cbf474774 100644
--- a/crypto/mem.c
+++ b/crypto/mem.c
@@ -358,6 +358,9 @@ char *CRYPTO_strdup(const char *str, const char *file, int line)
 {
     char *ret = CRYPTO_malloc(strlen(str) + 1, file, line);
 
+    if (ret == NULL)
+        return NULL;
+
     strcpy(ret, str);
     return ret;
 }